In pressing and molding a shadow mask or the like, press-molding oil containing alkyl carbonate shown in the following Chemical Formula as an active ingredient is coated on a press mold. After pressing and molding a metallic material with the press mold, the press-molding oil is washed and removed with warm water. Alternatively, the oil is thermally decomposed. As a result, less than about 10µ g/cm 2 oil is left as residue on the product.
where a and b are an integer from one to six; x and y are an integer from 0 to 30; R 1 and R 2 are an alkyl group, cycloalkyl group, alkylphenyl group, benzyl group or alkylbenzyl group having from one to thirty carbon atoms and straight or branched alkyl chains.